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#if NET_4_0
// Scheduler.cs
//
// Copyright (c) 2008 Jérémie "Garuma" Laval
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
//
using System;
using System.Collections.Concurrent;
namespace System.Threading.Tasks
{
internal class Scheduler: TaskScheduler, IScheduler
{
IProducerConsumerCollection<Task> workQueue;
ThreadWorker[] workers;
bool isPulsable = true;
public Scheduler ()
: this (Environment.ProcessorCount, 0, ThreadPriority.Normal)
{
}
public Scheduler (int maxWorker, int maxStackSize, ThreadPriority priority)
{
workQueue = new ConcurrentQueue<Task> ();
workers = new ThreadWorker [maxWorker];
for (int i = 0; i < maxWorker; i++) {
workers [i] = new ThreadWorker (this, workers, workQueue, maxStackSize, priority);
}
}
public void AddWork (Task t)
{
// Add to the shared work pool
workQueue.TryAdd (t);
// Wake up some worker if they were asleep
PulseAll ();
}
public void ParticipateUntil (Task task)
{
if (AreTasksFinished (task))
return;
ParticipateUntil (delegate {
return AreTasksFinished (task);
});
}
public bool ParticipateUntil (Task task, Func<bool> predicate)
{
if (AreTasksFinished (task))
return false;
bool isFromPredicate = false;
ParticipateUntil (delegate {
if (predicate ()) {
isFromPredicate = true;
return true;
}
return AreTasksFinished (task);
});
return isFromPredicate;
}
// Called with Task.WaitAll(someTasks) or Task.WaitAny(someTasks) so that we can remove ourselves
// also when our wait condition is ok
public void ParticipateUntil (Func<bool> predicate)
{
ThreadWorker.WorkerMethod (predicate, workQueue, workers);
}
public void PulseAll ()
{
if (isPulsable) {
foreach (ThreadWorker worker in workers) {
if (worker != null)
worker.Pulse ();
}
}
}
public void InhibitPulse ()
{
isPulsable = false;
}
public void UnInhibitPulse ()
{
isPulsable = true;
}
public void Dispose ()
{
foreach (ThreadWorker w in workers) {
w.Dispose ();
}
}
bool AreTasksFinished (Task parent)
{
return parent.IsCompleted;
}
#region Scheduler dummy stubs
protected override System.Collections.Generic.IEnumerable<Task> GetScheduledTasks ()
{
throw new System.NotImplementedException();
}
protected internal override void QueueTask (Task task)
{
throw new System.NotImplementedException();
}
protected internal override bool TryDequeue (Task task)
{
throw new System.NotImplementedException();
}
protected override bool TryExecuteTaskInline (Task task, bool taskWasPreviouslyQueued)
{
throw new System.NotImplementedException();
}
public override int MaximumConcurrencyLevel {
get {
return base.MaximumConcurrencyLevel;
}
}
#endregion
}
}
#endif
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